Abstract
To trigger the rotated spark switch in a CO2 laser stably and reliably,a high-voltage pulse trigger system is designed and a new method for driving and protecting Insulated Gate Bipolar Transistor(IGBT) is proposed.According to the trigger structure of rotated spark switch in the CO2 laser,a pulsed source which can output 100-500 Hz repetition-rate pulses and a single pulse is developed with the EPM3512 CPLD chip and the IGBT drive circuit with over-current,over-voltage protection and Electromagnetic Compatibility(EMC) design is proposed by a optocoupler HCPL-3120.Besides,the model of a high-voltage pulse transformer is simulated by PSPICE software.Finally,an experimental platform is buit to test the system performance online.Experimental results indicate that the high-voltage pulse trigger system can output high-repetition-rate pulses higher than 38 kV continuously and stably,which satisfies the requirements of the rotated spark switch in the CO2 laser for stability and reliability.
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